:host ::ng-deep .long-div {
    height: 300px;
    overflow-y: scroll;
    background-image: url(//zos.alipayobjects.com/rmsportal/RmjwQiJorKyobvI.jpg);
}

 :host ::ng-deep .long-div-inner {
    height: 1500px;
}

 :host ::ng-deep .long-div .ant-back-top {
    right: 150px;
}

 :host ::ng-deep strong {
    color: rgba(64, 64, 64, 0.6);
}

:host ::ng-deep .ant-back-top {
    right: 50px;
}

:host ::ng-deep .ant-back-top-content {
    background-color: #e86b99;
    opacity: .8;
}

:host ::ng-deep .ant-back-top-content:hover {
    background-color: #e86b99;
    opacity: 1;
}